When you take them in to git turned, inspect them over carefully. The machine shop should be able to tell you the thickness of the rotors and if it will be the minimum safe thickness after turning. It will be yer call then. Even new rotors need to be turned after they are bolted to the hub to make sure they are true.

Wheel bearings are pretty easy to do. Do you have a 2WD or 4WD? I guess you have the factory service manual to guide you through the process?

1998 T-100 Xtra cab SR5 2WD Auto; Roadmaster Active Suspension; Yokohama Geolander HT-S; lowered air dam; full belly pan; 4? diffuser; 11" side skirts; dual transmission coolers; 67% grill blocked; Auto-RX'd; ScanGauge II/Ultra-Gauge